AuthorTopic: Missing & Sputtering (Read 3789 times)

I have a 2004 Road King Custom with 28,000 miles on it. Well maintained and stored in a garage. Recently it has started missing and sputtering - running rough. I changed the plugs - no help. The manual says to change the plug wires. Any other thoughts?

I have a 2004 Road King Custom with 28,000 miles on it. Well maintained and stored in a garage. Recently it has started missing and sputtering - running rough. I changed the plugs - no help. The manual says to change the plug wires. Any other thoughts?

Bladerunner

If there are no codes, I would check the intake seals and do a fuel pressure test. On that bike it should hold pressure when you turn off the power. If it drops to zero fast, you have a hole in an internal line. Also, if it happens less with a full tank that's an indicator as well.

CKP – Crank Position Sensor. The CKP generates an “AC signal” which is sent to the ECM where it is used to reference engine position (TDC) and speed.

It's fule injected and the plugs ceramic is clean & white - no caramel color - like it's running really lean. The motor will idle for a couple mintues and then die.

Think this CKP sensor could be causing this?

Absolutely. Without a good signal from the crank position sensor, the ignition timing will be all over the place and you will be lucky to get the engine to run at all. Check the wires leading from the crank position sensor for damage. It isn't uncommon for the sensor or the wires to be damaged when changing oil filters if the wrong type of wrench is used.

Don't worry about the part number that shows up at the end of the DTC check, that's just the number of the module and doesn't have anything to do with your problem. It's just for reference.

Absolutely. Without a good signal from the crank position sensor, the ignition timing will be all over the place and you will be lucky to get the engine to run at all. Check the wires leading from the crank position sensor for damage. It isn't uncommon for the sensor or the wires to be damaged when changing oil filters if the wrong type of wrench is used.

Don't worry about the part number that shows up at the end of the DTC check, that's just the number of the module and doesn't have anything to do with your problem. It's just for reference.

Jerry

Also if the sensor is like on most cars, it won't throw any codes, it just senses the crank revolution, so if it doesn't sense the crank coming around each time, it just doesn't allow spark/fuel. I have had to replace two on my truck, ran like chit!